Added support to stored scoped functions on Go To Symbol

With the actual branch this is ignored by Go To Symbol: *stored = function() end* - this stored function isn't listed.

So I added support to stored scoped functions. Now go to symbol captures all these different kinds of function implementations:

```lua
local stored
stored = function() end

local class = {}
local stored; class:stored = function() end

class.stored1 = function () end

local function loc(params) end

function glob(params) end
```

All of them show up after hitting Cmd+R:
![screen shot 2014-07-09 at 1 17 30 am](https://cloud.githubusercontent.com/assets/248383/3519815/06774c92-0720-11e4-8aaa-073365a31750.png)

With the actual code, these would be ignored: *stored, class:stored, class.stored1*.